Study the Reuse of Oyster Shell
| Autor: | Chia-Wei Lai, 賴家煒 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 The oyster is the most common creature of fishing culture in the coast. However, most of the time people only eat oyster meat and discard oyster shells as waste. Therefore, the study is to recycle the discarded oyster shells, synthesize them into oxygen release agents of calcium oxide and phosphate adsorbent in order to reduce anaerobic lake sediment and eutrophication, and to restore ecological environment at the bottom of the lake. After oyster shells are smashed and sintered into calcium oxide at high temperatures, they will be made into calcium peroxide products by using hydrogen peroxide. Otherwise, we can also let the powder of oyster shells dissolve into calcium chloride solution by using hydrochloric acid, and then make it into calcium peroxide products by using hydrogen peroxide and ammonia. Next, we will mix calcium peroxide on the market with the home-made one, and then make it into a kind of oxygen-releasing compound by adding some other substances. Finally, we will pack it into the oxygen tube and place it in the anaerobic dirt for the purpose of the oxidation test of organic compounds. The content of organic carbon in the bottom substrates of Jin-Cheng Lake in HsinChu City is extremely high (even over 4%). So, we use the oxygen tube made by ORC to enhance the oxygen content of bottom substrates, but the effects are limited. Besides, the oxygen tubes are too expensive to improve the habitat on a large scale. However, surprisingly, in the phosphate adsorbent test, we find the calcium oxide we get after sintering the oyster shells has wonderful cleaning effect, but the side effect is unexpected increase of pH value in a very short period of time after treatment. So, the result shows that if we use this with commercial adsorbent products, there will be more positive effect, and there will be less influence on the pH value. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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